package tgc.edu.ljc.custom;

import java.io.ByteArrayOutputStream;
import java.nio.charset.Charset;

import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;

public class BCryptPasswordEncoder2 extends BCryptPasswordEncoder {
	 /*private static char[] base64EncodeChars = new char[] { 'A', 'B', 'C', 'D',
		        'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',
		        'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
		        'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',
		        'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3',
		        '4', '5', '6', '7', '8', '9', '+', '/', };*/
				
		    private static byte[] base64DecodeChars = new byte[] { -1, -1, -1, -1, -1,
		        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		        -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
		        -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59,
		        60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
		        10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1,
		        -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
		        38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1,
		        -1, -1 };
		    /**
			 * 对密码进行解密
			 * */
			public static byte[] decode(String str) {
				byte[] data = str.getBytes();
				int len = data.length;
				ByteArrayOutputStream buf = new ByteArrayOutputStream(len);
				int i = 0;
				int b1, b2, b3, b4;

				while (i < len) {
					do {
						b1 = base64DecodeChars[data[i++]];
					} while (i < len && b1 == -1);
					if (b1 == -1) {
						break;
					}

					do {
						b2 = base64DecodeChars[data[i++]];
					} while (i < len && b2 == -1);
					if (b2 == -1) {
						break;
					}
					buf.write((int) ((b1 << 2) | ((b2 & 0x30) >>> 4)));

					do {
						b3 = data[i++];
						if (b3 == 61) {
							return buf.toByteArray();
						}
						b3 = base64DecodeChars[b3];
					} while (i < len && b3 == -1);
					if (b3 == -1) {
						break;
					}
					buf.write((int) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));

					do {
						b4 = data[i++];
						if (b4 == 61) {
							return buf.toByteArray();
						}
						b4 = base64DecodeChars[b4];
					} while (i < len && b4 == -1);
					if (b4 == -1) {
						break;
					}
					buf.write((int) (((b3 & 0x03) << 6) | b4));
				}
				return buf.toByteArray();
			}
	
	@Override
	public String encode(CharSequence rawPassword) {
//		System.out.println(rawPassword);
		return super.encode(rawPassword);
	}

	@Override
	public boolean matches(CharSequence rawPassword, String encodedPassword) {
		byte[] bytes = decode(rawPassword.toString());
		String password= new String(bytes);
//		System.out.println("password:"+password+"=======");
		return super.matches(password, encodedPassword);
	}
	
}
